Nalf Type Switch-Disconnector - ABB UniGear ZS1 Instruction Manual

Fig. 130: Preparation for the operation of earthing switch in
panel with the switch-disconnector
Operating lever prepared for the operation ON
207.1 Position indicator of earthing switch
208.1 Operating shaft for the earthing switch
209 Lockable operating handle – Chubb lock
210 Lockable operating handle – padlock
80

6.2.10 NALF type switch-disconnector

The NALF type switch-disconnectors, a combination of switch-disconnector with fuses and type E
earthing switches are intended for indoor use in switchgear. The switch-disconnectors are capable of
to opening and closing loaded and unloaded inductive and capacitive circuits. In the open position the
device has a visible isolating distance.
The switch-disconnectors are used in combination with power fuses for short-circuit protection . This
combination excludes two-phase power supply, because interruption of any fuse link causes the
opening of switch-disconnector by means of its tripping system.
The type E earthing switches are constructed with a snap closing mechanism. They are capable of
closing and carrying short-circuit currents.
Operating mechanism of switch-disconnector for use in UniGear switchgear
Operating mechanism A – with two springs.
The opening spring is always charged before switch-disconnector closing. This means that the closed
switch-disconnector always has opening spring stored energy and opening follows immediately with
the manual lever, shunt opening release or tripping mechanism of fuses.
This mechanism makes remote opening possible and, in the combination with motor operator, makes
complete remote control possible.
The type E earthing switch is always operated locally by means of operating lever 215 (figure 131).To
secure the protection of connected HV equipment the UniGear ZS1 switchgear with switch-disconnector
uses CEF type high voltage fuses. The UniGear ZS1 switchgear with NALF switch-disconnector can
be equipped with fuses in the range indicated in the following table:
U [kV] I min. [A]
rated rated
3.6 / 7.2 6
12 6
17.5 6
24 6
In the case where the switch-disconnector without HV fuses will be required, the current-carrying bars
will be inserted in holders instead of HV fuses to maintain the same location of the earthing switch.
Note
The switch-disconnector and earthing switch can only be operated with the switchgear panel door
closed.
The switch-disconnector and earthing switch are mutually mechanically interlocked.
I max. [A]
rated
200
125
160
125
209
210
207.1
208.1
215
Fig. 131: Preparation for the operation of earthing
switch in panel with the switch-
disconnector
Operating lever prepared for the opera-
tion OFF
215 Operating lever